Non-contrast Magnetic Resonance Imaging versus the Multiphase Computed Tomography with Respect to the Asia–Pacific Clinical Practice Guidelines: A Diagnostic Performance Study for Liver Cancer

2021 ◽  
Vol 32 (3) ◽  
pp. 318-326
Author(s):  
Yang Wei ◽  
◽  
Liu Haifen ◽  
Li Xiang ◽  
Zhang Shutong ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Clinical Practice ◽  
Magnetic Resonance ◽  
Liver Cancer ◽  
Diagnostic Performance ◽  
Asia Pacific ◽  
Resonance Imaging ◽  
Performance Study ◽  
Contrast Magnetic Resonance

Arterial Spin Labeling for the Etiological Workup of Intracerebral Hemorrhage in Children

Stroke ◽  
2021 ◽  
Author(s):  
Jean François Hak ◽  
Grégoire Boulouis ◽  
Basile Kerleroux ◽  
Sandro Benichi ◽  
Sarah Stricker ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Intracerebral Hemorrhage ◽  
Computed Tomography Angiography ◽  
Arterial Spin Labeling ◽  
Diagnostic Performance ◽  
Spin Labeling ◽  
Digital Subtraction ◽  
Resonance Imaging

Background and Purpose: Pediatric nontraumatic intracerebral hemorrhage accounts for half of stroke in children. Early diagnostic of the causative underlying lesion is the first step toward prevention of hemorrhagic recurrence. We aimed to investigate the performance of arterial spin labeling sequence (ASL) in the acute phase etiological workup for the detection of an arteriovenous shunt (AVS: including malformation and fistula), the most frequent cause of pediatric nontraumatic intracerebral hemorrhage. Methods: Children with a pediatric nontraumatic intracerebral hemorrhage between 2011 and 2019 enrolled in a prospective registry were retrospectively included if they had undergone ASL-magnetic resonance imaging before any etiological treatment. ASL sequences were reviewed using cerebral blood flow maps by 2 raters for the presence of an AVS. The diagnostic performance of ASL was compared with admission computed tomography angiography, other magnetic resonance imaging sequences including contrast-enhanced sequences and subsequent digital subtraction angiography. Results: A total of 121 patients with pediatric nontraumatic intracerebral hemorrhage were included (median age, 9.9 [interquartile range, 5.8–13]; male sex 48.8%) of whom 76 (63%) had a final diagnosis of AVS. Using digital subtraction angiography as an intermediate reference, visual ASL inspection had a sensitivity and a specificity of, respectively, 95.9% (95% CI, 88.5%–99.1%) and 79.0% (95% CI, 54.4%–94.0%). ASL had a sensitivity, specificity, and accuracy of 90.2%, 97.2%, and 92.5%, respectively for the detection of the presence of an AVS, with near perfect inter-rater agreement (κ=0.963 [95% CI, 0.912–1.0]). The performance of ASL alone was higher than that of other magnetic resonance imaging sequences, individually or combined, and higher than that of computed tomography angiography. Conclusions: ASL has strong diagnostic performance for the detection of AVS in the initial workup of intracerebral hemorrhage in children. If our findings are confirmed in other settings, ASL may be a helpful diagnostic imaging modality for patients with pediatric nontraumatic intracerebral hemorrhage. REGISTRATION: URL: https://www.clinicaltrials.gov ; Unique identifiers: 3618210420, 2217698.

scholarly journals Magnetic resonance imaging and computed tomography in the diagnosis of cerebral venous infarction

2021 ◽  
Vol 25 (4) ◽  
pp. 23-30
Author(s):  
P. M. Kotlyarov ◽  
I. Dz. Lagkueva ◽  
N. I. Sergeev
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Clinical Practice ◽  
Magnetic Resonance ◽  
Clinical Observation ◽  
Resonance Imaging ◽  
Venous Infarction ◽  
The Brain ◽  
Venous Stroke

A clinical observation of the diagnosis of cerebral venous stroke, rare in clinical practice, based on the data of magnetic resonance imaging and computed tomography of the brain, is presented, the semiotics of the revealed changes is described.

scholarly journals Phase-contrast magnetic resonance imaging to assess renal perfusion: a systematic review and statement paper

2019 ◽  
Vol 33 (1) ◽  
pp. 3-21 ◽  
Author(s):  
Giulia Villa ◽  
Steffen Ringgaard ◽  
Ingo Hermann ◽  
Rebecca Noble ◽  
Paolo Brambilla ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Systematic Review ◽  
Blood Flow ◽  
Clinical Practice ◽  
Magnetic Resonance ◽  
Kidney Disease ◽  
Phase Contrast ◽  
Resonance Imaging ◽  
Non Invasive ◽  
Contrast Magnetic Resonance

Abstract Objective Phase-contrast magnetic resonance imaging (PC-MRI) is a non-invasive method used to compute blood flow velocity and volume. This systematic review aims to discuss the current status of renal PC-MRI and provide practical recommendations which could inform future clinical studies and its adoption in clinical practice. Methodology A comprehensive search of all the PC-MRI studies in human healthy subjects or patients related to the kidneys was performed. Results A total of 39 studies were included in which PC-MRI was used to measure renal blood flow (RBF) alongside other derivative hemodynamic parameters. PC-MRI generally showed good correlation with gold standard methods of RBF measurement, both in vitro and in vivo, and good reproducibility. Despite PC-MRI not being routinely used in clinical practice, there are several clinical studies showing its potential to support diagnosis and monitoring of renal diseases, in particular renovascular disease, chronic kidney disease and autosomal dominant polycystic kidney disease. Discussion Renal PC-MRI shows promise as a non-invasive technique to reliably measure RBF, both in healthy volunteers and in patients with renal disease. Future multicentric studies are needed to provide definitive normative ranges and to demonstrate the clinical potential of PC-MRI, likely as part of a multi-parametric renal MRI protocol.

scholarly journals Comparative Evaluation of 4-Dimensional Computed Tomography and 4-Dimensional Magnetic Resonance Imaging to Delineate the Target of Primary Liver Cancer

2021 ◽  
Vol 20 ◽  
pp. 153303382110454
Author(s):  
Yukai Chen ◽  
Guanzhong Gong ◽  
Yinxing Wang ◽  
Chenlu Liu ◽  
Ya Su ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Liver Cancer ◽  
Primary Liver Cancer ◽  
Organs At Risk ◽  
Liver Volume ◽  
Resonance Imaging ◽  
Tumor Delineation ◽  
The Difference

Purpose: To evaluate the feasibility of 4-dimensional magnetic resonance imaging (4DMRI) in establishing the target of primary liver cancer in comparison with 4-dimensional computed tomography (4DCT). Methods and Materials: A total of 23 patients with primary liver cancer who received radiotherapy were selected, and 4DCT and T2w-4DMRI simulations were conducted to obtain 4DCT and T2w-4DMRI simulation images. The 4DCT and T2w-4DMRI data were sorted into 10 and 8 respiratory phase bins, respectively. The liver and gross tumor volumes (GTVs) were delineated in all images using programmed clinical workflows under tumor delineation guidelines. The internal organs at risk volumes (IRVs) and internal target volumes (ITVs) were the unions of all the phase livers and GTVs, respectively. Then, the artifacts, liver volume, GTV, and motion range in 4DCT and T2w-4DMRI were compared. Results: The mean GTV volume based on 4DMRI was 136.42 ± 231.27 cm3, which was 25.04 cm3 (15.5%) less than that of 4DCT (161.46 ± 280.29 cm3). The average volume of ITV determined by 4DMRI was 166.12 ± 270.43 cm3, which was 22.44 cm3 (11.9%) less than that determined by 4DCT (188.56 ± 307.57 cm3). Liver volume and IRV in 4DMRI increased by 4.0% and 6.6%, respectively, compared with 4DCT. The difference in tumor motion by T2w-4DMRI based on the centroid was greater than that of 4DCT in the L/R, A/P, and S/I directions, and the average displacement differences were 2.6, 2.8, and 6.9 mm, respectively. The severe artifacts in 4DCT were 47.8% (11/23) greater than in 4DMRI 17.4% (4/23). Conclusions: Compared with 4DCT, T2-weighted and navigator-triggered 4DMRI produces fewer artifacts and larger motion differences in hepatic intrafraction tumors, which is a feasible technique for primary liver cancer treatment planning.

Sign in / Sign up

Export Citation Format

Share Document